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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2015
Long-term debt          
Consideration received in the sale, financing obligation       $ 6,750  
Amortization of debt issuance costs $ 658 $ 677 $ 1,989 1,597  
Building Purchase Mortgage          
Long-term debt          
Fully repaid outstanding balance of the mortgage   $ 4,500   $ 4,500  
Building Purchase Mortgage          
Long-term debt          
Credit agreement, outstanding balance         $ 5,100